I did an article on WW2 movies that will be (hopefully) coming out in 2018, which I will update regularly:

https://ww2movies.com/article/new-ww2-movies-in-2018-4

I don't have a lot of information regarding the movie "Overlord", but apparently from what i've read it is supposed to be a horror (and maybe sci-fi?) movie. The guy who is writing the screenplay also worked on "Captain Phillips", and "The Hunger Games", the latter being pretty lame in my opinion.

What movie are you looking forward to seeing?